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Article #11838Re: 040 vs 030 SPEC nos.
From: Bill Ledbetter
Date: Tue, 28 May 1991 18:34
Date: Tue, 28 May 1991 18:34
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1356 bytes
abaum (Allen Baum) writes: >I'm sorry to disappoint you, but the 68040 runs effectively a half >speed bus. A 25Mhz '040 is running at 50Mhz internally. There are, >in fact, two clock pins, one at 25Mhz, and one at 50. For comparison, >you should be comparing 50Mhz '030s and 25Mhz '040s. Well, in general, an 040 at 25MHz runs both the internals (caches, ALUs, etc.) and the external bus at 25MHz: the 50MHz input is used to get timing edges. In general, a 25MHz 030 runs the internals at 12.5MHz and the external bus at 25Mhz. --------------------------------------------------------------------------- Bill Ledbetter Motorola Inc. MD OE37 email: cs.utexas.edu!oakhill!billl 6501 William Cannon Dr. West Austin, TX 78735-8598 -- --------------------------------------------------------------------------- Bill Ledbetter Motorola Inc. MD OE37 email: cs.utexas.edu!oakhill!billl 6501 William Cannon Dr. West
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!oakhill!billl From: billl@oakhill.sps.mot.com (Bill Ledbetter) Newsgroups: comp.arch Subject: Re: 040 vs 030 SPEC nos. Message-ID: <1991May28.183453.13821@oakhill.sps.mot.com> Date: 28 May 91 18:34:53 GMT References: <181@armltd.uucp> Distribution: comp Organization: Motorola Inc., Austin, Texas Lines: 24